Yes typical dosing ratio is 1:2 caffeine:theanine. With typical dosing being 100mg caffeine:200 mg l-theanine You can buy l-theanine pills and take it with co

Yes typical dosing ratio is 1:2 caffeine:theanine. With typical dosing being 100mg caffeine:200 mg l-theanine You can buy l-theanine pills and take it with coffee. If you'd like it from nature, Matcha has the highest L-theanine content. This is because L-theanine is an anti-oxidant made in the roots and sent to the leaves to prevent against damage from the sun. Matcha tea plants are kept in the shade for the last couple of months, so they build up the theanine and it is not used up. The full leaves are then ground up, but will only contain around 40 mg per serving, which is why I generally recommend supplementing it. Suntheanine has a patented form that is made in a biofermentation process that yields nearly 100% pure L-isomer theanine. Also interesting is that, while L-theanine the molecule wasn't "discovered" until 1949, the Japanese ceremonial tea scale has been for hundreds of years, organized by increasing levels of theanine content.